The only approved method of installing SCEs is with sce-load. Copying their contents to a partition or using a 'scatter mode' traditional hard drive install is not supported. Actually, it is for the most part the startup scripts that take up the most load time, the actual linking of their contents is done with the cp command and since it is linking and not copying that is done in a very fast manner. And of course, the startup scripts are necessary for expected behavior of the installed packages.